Development of a mid-infrared high dispersion spectrograph (IRHS) for the Subaru telescope

Tokoro, Hitoshi; Atarashi, Masashi; Omori, Masako; Machida, Takashi; Hirabayashi, Shigeyuki; Kobayashi, H.; Hirahara, Yasuhiro; Masuda, Tadashi; Ebizuka, Noboru; Kawaguchi, Kenichi

doi:10.1117/12.461936

Cited by 4 publications

(2 citation statements)

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“…Finally, we have successfully fabricated germanium immersion gratings for the prototype IRHS by using a 3D profile grinding/turning machine with nano-meter precision and ELID (ELectrolytic In-process Dressing) method with a grinding cup of cast iron bonded [16][17][18]. The prototype IRHS with R ~ 45,000 is complete and preparing for the first light observation in this winter [19]. The size of the prototype immersion grating is 30 by 30 by 72 mm.…”

Section: Novel Immersion Gratingmentioning

confidence: 99%

Novel immersion grating, VPH grating and quasi-Bragg grating

et al. 2006

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We have successfully fabricated germanium immersion gratings with resolving power of 45,000 at 10 µm by using a nano precision 3D grinding machine and ELID (ELectrolytic In-process Dressing) method. However the method spends large amount of machine times. We propose grooves shape with a new principle for a solid grating, which achieves high performance and lower cost.We have developed volume phase holographic (VPH) grisms with zinc selenide (ZnSe) prisms for spectrograph of the Subaru Telescope and the other telescopes. While a VPH grism with high index prisms achieves higher dispersion, diffraction efficiency of VPH grating decreases toward higher orders. A "quasi-Bragg grating" which inherits advantage of a VPH grating achieves high diffraction efficiency toward higher orders.Wavelength tuners with a pair of counter-rotation prisms for a VPH and quasi-Bragg grating obtain high diffraction efficiency over wide wavelength range. The novel immersion grating, VPH grism with high index prisms, quasi-Bragg grating and wavelength tuners dramatically reduce volumes of astronomical spectrographs.

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Section: Novel Immersion Gratingmentioning

confidence: 99%

Novel immersion grating, VPH grating and quasi-Bragg grating

et al. 2006

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“…The germanium immersion grating for instance could reduce 1/64 as the total volume of a spectrograph with a conventional reflection grating since refractive index of germanium is over 4.0 from 1.6 to 20 m. The size of IRHS become 2m 3 covered with a cooled vacuum chamber [19]. The immersion grating is not only a powerful dispersion element for grand-based applications, but also an ideal dispersion element for space applications (Fig.10).…”

Section: Trial Fabrications For Solid Gratingsmentioning

confidence: 99%

Grism and immersion grating for space telescope

Ebizuka

Oka

Yamada

et al. 2017

International Conference on Space Optics — ICSO 2004

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WINERED: a warm near-infrared high-resolution spectrograph

Ikeda¹,

Kobayashi

Kondo

et al. 2006

SPIE Proceedings

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We are developing a new near-infrared high-resolution (R max = 100, 000) and high-sensitive spectrograph WINERED, which is specifically customized for short NIR bands at 0.9−1.35 µm. WINERED employs the following two novel approaches in the optical system: (1) portable design with a ZnSe immersion grating and (2) warm optics without any cold stops. These concepts result in several essential advantages as follows: easy to build, align, and maintain; these result in a short development time and low cost. WINERED employs a VIRGO HgCdTe 2k × 2k array by Raytheon as the detector. We are developing our own array control system that aims at a low readout noise (< 10 e − ) with a readout time of about 3 sec. Our goal is to achieve a high sensitivity of R = 100, 000 for a NIR spectroscopy of 15 mag and 17 mag point sources with 4 m and 10 m telescopes, respectively. We have just finalized the optical design and produced a proto-type electronics, which are described in the companion papers by Yasui et al. 1 and Kondo et al., 2 respectively. We plan to complete this instrument by the end of 2008 and hope to attach it to various 4 to 10 m telescopes as a PI-type instrument.

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Development of a mid-infrared high dispersion spectrograph (IRHS) for the Subaru telescope

Cited by 4 publications

References 4 publications

Novel immersion grating, VPH grating and quasi-Bragg grating

Novel immersion grating, VPH grating and quasi-Bragg grating

Grism and immersion grating for space telescope

WINERED: a warm near-infrared high-resolution spectrograph

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